feat: add partMap directive for dynamic part names#12226
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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PartNameInfo type forbids null/undefined, but the directive supports them and the tests pass them. |
DiegoCardoso
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Jul 24, 2026
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Lit ships
classMapfor applying dynamic class names, but has no equivalent for thepartattribute. This PR adds apartMapdirective to@vaadin/component-basethat follows the same approach asclassMap, just for part names: it applies part names from a key-value map, updates the element'sparttoken list in place after the first render, and never removes part names declared statically in the attribute.Part of #10789